Improvement in machines for dressing millstones



1. w. PARISH.

Machines for Dressing Mill-Stones. No; 141,288. Patentedjuly29,l873.

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JOEL W. PARISH, OF MGFARLANDS, VIRGINIA.

Specification forming part of Letters Patent No. 141,288, dated July29,1873; application filed February 21, 1873.

To all whom it may concern:

Be it known that I, JOEL W. PARISH, of McFarlands, in the county ofLunenburg and State of Virginia, have invented a new and ImprovedMillstone Dressing Machine, of which the following is a specification:

The invention consists in the improvement of machines for dressingmillstones, as hereinafter described and pointed out in the claims.

Figure 1 is a side elevation of my improved millstonedressing machine,and Fig. 2 is a plan view.

Similar letters of reference indicate corresponding parts.

A represents the stone to be dressed, and B the spindle of it. 0represents a small rectangular frame or platform, about as long as, or alittle longer than, the radius of the stone resting on the face of it,and clamped to the spindle at one corner between the cross-pieces D E,which project beyond the side a little, so that said side will range alittle distance from a radial line of the stone, and parallel with it.One of said cross-pieces is pivoted to the opposite side of the frame atF, and a clamping-bolt, G, and nut are provided for securing the frameto the spindle in this-manner, so that it can be swung around thespindle on the face of the stone. H is a long plate or frame as long asthe frame 0, but not quite as wide, which is mounted on the transverseways I, so as to slide forward and back on frame 0, and it is providedwith a cranked adjusting-screw, K, for shifting it. On this frame H is aplatform, J, which slides nearly the whole length of it on ways L. Itcarries the pick-stock M, also the crank-shaft N, with tappets O forraising it, the spring P for forcing it down, the feeding-pinions Q andR, and the train of gears S, T, U, and V for workin g the latter pinion.The pinion Q, which is on the crank-shaft, is for giving the fast feedfor cracking by gearing alternately with the rack-bars W, one of whichis above it and the other below it, and they are connected together atboth ends-pivoted at one end, 00, and at the other end arranged to beshifted up or down from notches a to notches b, and vice versa to changefrom one to the other, by which the platform is moved forward and back,while the crank-shaft is continuously turned in the same direction. Thepinion R is used for the slow feed for dressing furrows, the rack-barsbeing shifted to gear with it by being placed on the opposite sides ofthe posts Y in the same manner as represented on the front side inFig. 1. Spring-plates Z are used on the post, having the notches a b forthe ends of the rack-bars, to hold them in the notches and allow ofshifting them readily from one to another. The picks d are fastened in asocket-piece, c, by a set-screw, f, so as to be put in and taken outreadily, and this socket-piece is jointed to the pick-stock by a pivotat g, a slotted plate, 1), and a bindingscrew, 13, so that thecutting-edge canbe adjusted either to a right or oblique angle with thepick-stock. The pick-stock is square, and is fitted in correspondingguides to hold the pick in the radial plane for cracking the lands, andat right angles thereto for dressing the furrows, the stock being takenout of the guides and shifted around a quarter of a revolution for thelatter purpose. The spring P engages the stock by notches j in thesidesthe lower one for cracking and the upper one for dressing thefurrows. The tension of the spring and the force of the blows areregulated by the adjusting-screw K.

It will be seen that the frame 0 is arranged so that the platform,sliding forward and backward on the frame H, will carry the picksparallel with the furrows that the shifting of the frame H on the frame0 will adjust them from line to line for fine or coarse cracking; thatby turning the pick-stock the picks can be adjusted for cracking orfurrowing; and that by shifting the socket-piece on the pick-stock thepicks can be adjusted to the angle of the furrows, and by the fast andslow feeds the picks can be moved alongthe stone radially at therequisite speeds for the different kinds of work, all in a mannercalculated to render the machine very efficient.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The sliding platform, carrying the toolstock,combined with a pinion of the feedgear working between two rack-bars, inthe manner and for the purpose set forth.

2. The pick d fastened in a socket, 0, jointed to the pick-stock at g,as and for the purpose specified.

JOEL W. PARISH. Witnesses:

WM. L. BRIDGFORTH, W. H. Lovn.

